package com.bestv.search.engine.compass.spellcheck;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.*;
import java.util.Iterator;

/**
 * Dictionary represented by a text file.
 * <p/>
 * <p/>
 * Format allowed: 1 word per line:<br/>
 * word1<br/>
 * word2<br/>
 * word3<br/>
 */
public class PlainTextDictionary implements Dictionary {

    private BufferedReader in;
    private String line;
    private boolean hasNextCalled;

    public PlainTextDictionary(File file) throws FileNotFoundException {
        in = new BufferedReader(new FileReader(file));
    }

    public PlainTextDictionary(InputStream dictFile) {
        in = new BufferedReader(new InputStreamReader(dictFile));
    }

    /**
     * Creates a dictionary based on a reader.
     */
    public PlainTextDictionary(Reader reader) {
        in = new BufferedReader(reader);
    }

    public Iterator getWordsIterator() {
        return new fileIterator();
    }

    final class fileIterator implements Iterator {
        public Object next() {
            if (!hasNextCalled) {
                hasNext();
            }
            hasNextCalled = false;
            return line;
        }

        public boolean hasNext() {
            hasNextCalled = true;
            try {
                line = in.readLine();
            } catch (IOException ex) {
                throw new RuntimeException(ex);
            }
            return (line != null) ? true : false;
        }

        public void remove() {
            throw new UnsupportedOperationException();
        }
    }

}
